Molecular dynamics simulation of tensile deformation shows that the high strength of nanotwinned copper is initially the result of the twin boundary pinning effect on dislocation motion, and that interface-mediated slip transfer mechanisms operate in the later stages of deformation. These mechanisms include the complete transmission of screw dislocations across twin boundaries via Fleischer and Friedel-Escaig mechanisms, the incomplete transmission of non-screw dislocations and transmission-induced jog formation. These factors are effective at maintaining the material's high strength and good ductility.

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